Welded tubing.



L. S. LAGHMAN.

WELDED TUBING.

APPLICATION FILED JUNE 14,1913.

1 1 O8, 1 9 1. Patented Aug. 25, 19m

j 3 Y INVENTOR j fi% Laurenae {glam/177mm 1 {2 l I er ATTORNEYS UNITED STATES PATENT OFFICE.

LAURENCE S. LACI-IMAN, OF NEW YORK, N. Y., ASSIGNO-R TO UNIVERSAL ELECTRIC WELDING COIYIPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

WELDED TUBING.

To all whom it may concern Be it known that I, LAURENCE S. LACH- MAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Velded Tubing, of which the following is a specification.

My invention relates to the construction of metal tubing.

The object is to provide a novel construction of tubing that will be substantially as strong as the previous constructions having a continuously welded or brazed longitudinal seam and that will have substantially as good a finish as tubing in which the longitudinal joint is composed of the abutted edges of the metal skelp or blank and which at the same time is capable of being readily and cheaply constructed.

To these ends my invention consists in the novel construction of tubing hereinafter de scribed and more particularly specified in the claims.

I Figure 1 is a plan of a section of metal tubing embodying my invention. Fig. 2 is a cross-section through the same on the line XX. Fig. 3 is a plan of a section of the stock from which my improved tubing is constructed. Fig. 4' is a cross section through the stock on a line coinciding with the center of one of the buttons, showing aid button applied to the stock preparatory to the welding operation to produce the finished tubing of the construction shown in Figs. 1 and 2. Fig. 5 is a plan of one of the buttons.

1 indicates the body of the tubing and 2 represents the longitudinal joint made by the closely abutted edges of the skelp when formed up in a suitable machine.

3 indicates a series of buttons or pieces of metal welded acros the edges of the longitudinal seam or joint as bridges and sunk in the material of the tubing so as to be sub stantially flush with the surface thereof as indicated in the cross-section Fig. 2. These welded buttons or pieces may be welded acros the joint by the well known electric welding process, in which case the buttons, one of which is indicated in plan in Fig. 5 and in side view in Fig. l, are applied one at a time upon the surface of the piece of stock Specification of Letters Patent.

Application filed June 14, 1913.

Patented Aug. 25, 1914.. Serial No. 773,655

and so as to lap the abutted edges forming the longitudinal joint and are then subjected to electrical heating and pressure in any.

suitable electric welding machine. This operation may be conducted either with or without an internal mandrel to support the work beneath the point of application of the button. lVhenconducted without any internal mandrel the pressure of the welding electrode upon the button will sink the button in the material of the tube, causing at the same time a slight bulge on the inner surface, as indicated in the cross-section Fig.

ton, in which case the pressur will consoli;

date or condense the button and a less or no projection will exist on the inside of the tubing, although, as before, the bridging button will be practically sunk in the material of the tubing so as to be practically flush with the surface of the stock and so as to present substantially the appearance shown in the drawings. In some cases, however, a slight bur may exist around the edge of thesunken button, which is preferably ground oif. Inasmuch as the electric welding process employed in a manner above indicated is a well known process and the shapes of electrodes employed will readily occur to those skilled in the art of welding, I have not described the same more in detail.

When the operation of constructing the tubing is conducted in the manner already explained without. any support beneath the button and within the tubing, the pressure exerted by the welding electrode practically results in counter-sinking the button in the material, the bulge as shown in the crosssection comprising substantially the displaced material of the tubular stock used. This is indicated by the presence of the slight line of division 5, as shown in the cross-section Fig. 2, which coincides'with the the edges and sunk in the material of the 5' line of divisionat the abutted' edges of the tubing. stock itself, said stock beneath the button 2. Metal tubing having the meeting or being depressed by theoperation so as to abutting edges of its longitudinal joint 5 project slightly into the bore of the tubing. united at interval by bridging pieces welded It is obvious that the shape of the button across the edges and flush with the surface 20 is a matter of choice and that any other oonof the tubing.

\ figuration besides a round shape might be Signed at New York in the county of New employed without departing from the inven- York and State of New York this 4th day of 1 tion; v June A. D. 1913.

' What if claim as my invention is: LAURENCE S. LAGIMAN.

1. Metal tubing haying'the meeting or V v Witnesses: abutting edges oi the. longitudinal oint HOWARD HIPKINS,

united at intervals by buttons welded across G. T. TISOHNER, Jr. 

